Model comparison
Claude Sonnet 5 vs Muse Spark 1.3
Claude Sonnet 5 and Muse Spark 1.3 score almost the same on the Noometry Index (54.5 vs 54.4), so choose on price, context window or the category you care about most.
Last verified . 33 shared benchmarks.
MetaSummary
- They share 33 benchmarks with published results for both. Claude Sonnet 5 scores higher in 2 categories and Muse Spark 1.3 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 5 leads 55.7 to 42.0.
- The biggest single-benchmark swing is FrontierMath Tier 4: 29.3% for Claude Sonnet 5 and 46.3% for Muse Spark 1.3.
- Muse Spark 1.3 is cheaper at $1.25 / $4.25 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 1M.
Side by side
| Claude Sonnet 5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 54.5 | 54.4 |
| Released | 2026-06-29 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $2 | $1.25 |
| Output $ / M tokens | $10 | $4.25 |
| Results tracked | 51 | 34 |
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Category by category
Coding Too close to call
Claude Sonnet 5: 55.5 (#20), Muse Spark 1.3: 56.1 (#18)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| CursorBench | 34.1% | 41.6% |
| LMArena WebDev | 1540 | 1655 |
| SciCode | 53.6% | 59.7% |
| LMArena Coding | 1483 | 1516 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.7% | — |
| GSO | 37.3% | — |
| WeirdML | 68.8% | — |
| ALE-Bench | 1,463 | — |
Agentic & Tool Use Claude Sonnet 5 leads
Claude Sonnet 5: 42.7 (#16), Muse Spark 1.3: 38.6 (#28)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | 54.5% | 57.8% |
| GBAEval | 65.3% | — |
| GDP.pdf | — | 27.6% |
| LMArena Search | 1194 | — |
| Vending-Bench 2 | 6,378 | — |
Reasoning Muse Spark 1.3 leads
Claude Sonnet 5: 48.2 (#37), Muse Spark 1.3: 52.9 (#27)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 75.1% | 85.1% |
| CritPt | 16.9% | 24.9% |
| Chess Puzzles | 35% | 38% |
| LMArena Hard Prompts | 1461 | 1503 |
| Mystery Game Puzzles | 35% | 25% |
| DTBench | 92.5% | 96.5% |
| LMCA | 50% | 53.9% |
| Bench to the Future 3 | 0.14 | 0.14 |
| Epoch Capabilities Index | 156.34 | 156.89 |
| SimpleBench | 60.6% | — |
| Surface Evolver Bench | 60% | — |
| ForecastBench | 61.1 | — |
Math Muse Spark 1.3 leads
Claude Sonnet 5: 66.1 (#21), Muse Spark 1.3: 72.4 (#16)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 65.6% | 74.4% |
| FrontierMath Tier 4 | 29.3% | 46.3% |
| OTIS Mock AIME 2024-2025 | 94.7% | 99.2% |
| LMArena Math | 1467 | 1497 |
| ProofBench | 77% | — |
Knowledge Claude Sonnet 5 leads
Claude Sonnet 5: 55.7 (#42), Muse Spark 1.3: 42.0 (#92)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1491 | 1516 |
| GPQA Diamond | 90.5% | — |
| SimpleQA Verified | 33.7% | — |
Multimodal Too close to call
Claude Sonnet 5: 42.4 (#26), Muse Spark 1.3: 43.0 (#21)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1275 | 1310 |
| LMArena Document | 1466 | 1471 |
| Blueprint-Bench 2 | 24.9% | — |
Multilingual Muse Spark 1.3 leads
Claude Sonnet 5: 54.0 (#55), Muse Spark 1.3: 57.8 (#6)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1431 | 1485 |
| LMArena Chinese | 1475 | 1527 |
| LMArena French | 1457 | 1534 |
| LMArena Korean | 1411 | 1513 |
| LMArena Russian | 1452 | 1491 |
| LMArena Spanish | 1436 | 1485 |
| LMArena German | 1448 | — |
| LMArena Japanese | 1422 | — |
Instruction Following Muse Spark 1.3 leads
Claude Sonnet 5: 76.6 (#39), Muse Spark 1.3: 77.8 (#14)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1453 | 1481 |
Long Context Too close to call
Claude Sonnet 5: 44.8 (#53), Muse Spark 1.3: 45.7 (#29)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1464 | 1491 |
Writing & Preference Muse Spark 1.3 leads
Claude Sonnet 5: 69.4 (#24), Muse Spark 1.3: 73.7 (#10)
| Benchmark | Claude Sonnet 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1443 | 1490 |
| LMArena Creative Writing | 1416 | 1450 |
| EQ-Bench Creative Writing | 1794 | 1906 |
| LMArena Multi-Turn | 1454 | 1486 |
| EQ-Bench 4 | 1236 | — |
Frequently asked questions
Is Claude Sonnet 5 better than Muse Spark 1.3?
Claude Sonnet 5 and Muse Spark 1.3 score almost the same on the Noometry Index (54.5 vs 54.4), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Sonnet 5 or Muse Spark 1.3?
Muse Spark 1.3 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Claude Sonnet 5 lists at $2 and $10.
Is Claude Sonnet 5 or Muse Spark 1.3 better for coding?
They score almost the same on coding (55.5 vs 56.1); test both on your own repository before choosing.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 1M.
How many benchmarks do Claude Sonnet 5 and Muse Spark 1.3 share?
33 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Muse Spark 1.3 has 34.